Ray-tracing techniques for image rendering have produced some of the most realistic images to date. They are also slow because the process of tracing a ray is computationally intensive and because there are many rays to be traced. However. since computations for each pixel are independent, ray tracing is amenable t o parallel processing uslng image space subdivision. The processor per subdivisi...

For realistic image synthesis and many other simulation applications, ray tracing is the only choice to achieve the desired realism and accuracy. Ray tracing has become such an important algorithm that an implementation in hardware is justified and desirable. The first ray tracing hardware realizations have been using floating point and logarithmic arithmetic. While floating point arithmetic re...

Reconstructing and designing media with continuously-varying refractive index fields remains a challenging problem in computer graphics. A core difficulty trying to tackle this inverse is that light travels inside such along curves, rather than straight lines. Existing techniques for make strong assumptions on the shape of ray medium, thus limit themselves where deflection relatively small. Mor...

Ray-tracing is one of the most popular techniques for rendering 3D images. Effects such as shadows, reflection, refraction and so on can be produced with this technique. However, raytracing is a point-sampling technique with well-known aliasing problems. In particular, small objects and small shadows can be hidden between rays and not be detected. No ray-tracing method, even using oversampling,...

Modeling and visualization of natural and realistic outdoor ecosystems like forests or meadows remains a highly challenging task in computer graphics. Convincing and non-artificial scenes require many thousands to millions of plants, each modeled with a high degree of geometric, shading, and lighting detail. At the same time many applications demand interactive rendering at high fidelity. In th...

The ray buuer algorithm presented here is part of an alternative strategy of ray tracing called breadth rst ray tracing. Breadth rst ray tracing diiers from usual pixel-wise rendering in tracing whole generations of rays together. This means that rst all rays of view are treated, next the set of re-ecting and refracting rays, then the reeecting and refracting rays caused by them, and so on. The...

The main objectif of this paper is to present a tool that we have developed subject to characterize and modelling indoor radio channel propagation at millimetric wave. The tool is based on the ray tracing technique (RTT). As, in realistic environment we cannot neglect the significant impact of Human Body Shadowing and other objects in motion on indoor 60 GHz propagation channel. Hence, our prop...

In this paper we present an efficient data structure and algorithms for GPU ray tracing of secondary effects like reflections, refractions and shadows. Our method extends previous work on layered depth cubes in that it uses layered depth cubes as an adaptive space partitioning scheme for ray tracing. We propose a new method to efficiently build LDCs on the GPU using geometry shaders available i...

This paper investigates the affect of pathloss and mobility in an urban environment on MANETs. Specifically, this investigation employs mobility and pathloss that resembles the mobility of pedestrians and pathloss in urban environments. We study the behavior of MANETs on a university campus and in the Paddington area of London England. The model utilizes ray tracing to provide realistic radio w...